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Jan. 1, 1929. 1,697,827 t R. M. coNNER PORTABLE BAKE OVEN Filed March 22,1924V lil) Patented `lan. l, 1929.

innen sra-rss;earner j RAYMOND IIIGV/'ER CONNER; OF PORTLAND, OREGOE, ASSIGNOR yTG FORTLAN GAS 8o.

COKE COJIIPANY,` OF PORTLAND, OREGQN, A CGR'PORATON @i GREG-GN.

PORTABLE BAKE (EVEN.

Application filed March 22, 1924. Serial No.l 701,683;

his invention relates to portable bake ovens and it comprises a heat insulated chamber, a tile hearth Within said chamber, a sheet metal top for said hearth, a gas burner beloiv'the hearth,r vertical passages `for products of combustion between the sides of the hearth and the side Walls of the chan'iber, a chimney at the. rear of the chamber, a longitudinal` flue extending` across'the` top of the hearth open at the front end and connected to the chimney at its rear end and a door located in Vthe 'front .vall of the chamber; all as more fully hereinafter set 'forth and as claimed.

In gas tired ovens of the type to ivhich the present invention relates the provision of an i of a construction which permits of port` Y' ty and which contains suiicient volume ot refractory material for ample heatstorage is a. desideratum'. It is very difficult in gas red ovens to obtain uniform distribution or" heat and at the same time economically ut-i- .line the heat delivered by the gas burner. These diliiculties are overcome in my oven by the unique and eiiicient construction to be described.

One et the objects of this invention is the provision of a, directly heated gas oven inv Vwhich the products" of combustion cannot come in contact with the material being baked.

Another o1E the objects of this invention is the provision of an oven of the type described ivl'iich is readily portable and which, at the same time, permits the combination of tno diiierent heatingl systems.

@ne ,known type of oven is that in which the hearth heat is taken advantage of to give a slow but constant baking. Another known type or' oven is that in 'which top heat is almost entirely relied upon to give intense localized heat aiiording quick baking.

In the present invention the advantages of these ar attained. by constructing the hearth of refractory tile or brick which heats slowly and retains its heat for a long period of time, and by providing the hearth with a metal Vtop which transmits the heat readily and permits rapid heating of the interior of the hearth While the tiles are still comparatively cool. l

ln the accompanying drawing ll have shown one form of a speoic embodiment of my invention.

Figure l is a vertical section through an even on line l-l of FigureQ;

Figure' 2 is a horizontal section on- 2-2 of Figure l.

lileferrinn` to the dra-Wings numeral l 1n- L u n ei 11 dicaies the hollow Wa v s o t ie oven, usua. y constructed ol sheet metal or the like. rllhese line Walls are 'filled With heat insulating mate-v rial Qand are fastened together by angle bars 3 and rivets 4. Located: in the front ivall of the oven is door 5 provided with suitable the oven, being attached at its rear end to-v vertical chimney l5. Vertical legs 16 or the like are attached to the corners of the oven.v A sheet metal box` 17, opened at the-top,

is provided 'for carrying and supporting the gas burnerll. rlhis box extends through` the frontand rear Walls or' the oven and supplies air for combustion oic the gas.

In operations, the oven may be used Jfor rapid baking y reliance on the top'heat; or it may be used for baking hearth bread or the like, relying upon the heat stored in the hearth alone,l or the baker may obtain any desired proportion of top. and bot-tom heat.

It it is desired to bake rapidly, relying on top heat alone, the material to be baked is placed on the hearth 7 through door 5 and the gas burner ll is lighted, the gas burning at full capacity. The bottoni and side tiles 8 and 9 of the hearth increase in temperature very slowly but the products of combustion traveling up through the passages l2 and across the top plate l0 heat the top plate to a high temperature and this heat is transmitted to the interior oi the hearth 7, giving' a rapid baking` in the hearth.

lf it is desired to bake hearth bread or the like the heating is continued until the bottom and sides of the hearth are raised to the proper temperature. rlhe bread is placed on the hearthv 7 through the door 5 and the burner ll is shut oth The heat'vvhich has been stored in the hearth is suhcient to give a slow, even baking. The retention of heat within the oven is enhanced by the heat insulating walls of the oven proper.

rllhe construction of the flue i3 with the inlet of the products of combustion at its front 14 gives a further advantage in overcoming any tendency toward cooling the front of the oven when opening the oven door for access to the hearth. The products of combustion, however, do not, at any time, reach the interior of the hearth and come in Contact with the material being baked.

My oven is readily adapted to use as a sectional baking plant. A plurality of units described may be readily stacked one upon the other. Each oven having its own heater may be operated and controlled independently of any oi' the other sections. It it is desired, only one of the sections may be used and the operation of the other sections will not be affected or interfered with. In this way, capacity can be increased at any time without discarding any equipment. Another advantage of a system of independent oven units is that one or more may be shut down for repairs or cleaning without necessitating shutting down the entire plant, as is necessary when one large oven is used.

Y What I claim is zl. A bake oven comprising` a heat insulated chamber, a heat-retaining hearth, a heatconducting top for the hearth, -a gas burner below the hearth, vertical passages for products of combustion between the sides of the hearth and the side walls of the chamber extending throughout their length, means extending from the rear wall of the chamber along the top of the hearth and terminating adjacent the forward endr thereol for conducting away the products of combustion, and a door in the liront wall or" the chamber.

2. A balie oven comprising a heat insu` lated chamber, a heat-retaining hearth, a heat-conducting top for the hearth, a gas burner belor7 the hearth, vertical passages for products of combustion between the sides of the hearth and the side walls of the chamber coextensive with the length thereof, a longitudinal tine extending across the top of the hearth, a chimney attached to the rear of the chamber, said flue being open at its front end and being connected to the chimney at its rear end, and a door in the 'front wall ot the chamber for access to the hearth.

8. A balie oven comprising a heat ins lated chamber, an oven therein spaced from the sides of said chamber `throughout its length but abutting the ront and rear walls thereof, said oven comprising a heat-retain inghearth, a heat-conducting top for the hearth sealed thereto,rsaid hearth and top being spaced from the bottom and tcp, respectively, ot said heat insulated chamber,

and a Aline extending forwardly from the rear of said heat insulated chamber and 'terminating adjacent the forward wall thereof above said oven whereby the products of combustion passing upwardly between the side walls o'j the oven and chamber throughout their length will be drawn to the forward part of said chamber and thence will pass through said iue to be conducted away.

In testimony whereoil have hereunto aiiiXed 1n f signature.

RAYMOND MOVER CONNER. 

